Illumination – Illuminated scale or dial
Reexamination Certificate
1998-07-27
2001-04-10
O'Shea, Sandra (Department: 2875)
Illumination
Illuminated scale or dial
C362S029000, C362S030000, C362S084000, C362S230000, C362S231000
Reexamination Certificate
active
06213613
ABSTRACT:
The invention concerns a lighting device for dashboard instruments in motor vehicles with at least one light source for the at least partial illumination of the dashboard instruments.
That kind of lighting devices are, for example, used in all motor vehicles for illuminating the dashboard instruments. For this the lighting device is always linked with a wiring installation which activates the headlights of the motor vehicle. As a result the dashboard illumination is activated concurrently with the switching on the headlights. The dashboard illumination can be done in very different ways. Thus with older types of motor vehicles one usually illuminates the dashboard with a light source emitting white light. With newer vehicles the individual digits and characters are already developed self-lighting, for example by appropriate light-emitting diodes), so that it is no longer necessary to lit up these digits and characters externally.
A problem with these well-known lighting installations of dashboards is the not optimal illumination or lighting of the dashboard. Certainly in some types of motor vehicles the dashboards are also already illuminated with orange or green light aside of the usual white light. An optimal reading of the dashboard instruments is however, not guaranteed with that.
As everybody knows the capacity of the human eye to focus automatically on different seeing distances, the so-called accommodation capacity diminishes with increasing age. From the 45th year up this deficiency becomes obvious so that for a sharp seeing in proximity one does need glasses. From the 50th year up even the normally healthy eye loses accommodation capacity as much that the unarmed dye only clearly discerns distant objects from about 2 m on, yet the closer ones more or less unsharply.
This deficiency is mainly irritating for older drivers who are able to see the more distant traffic events sharply but not he instruments of their dashboard because those is in relative small distance of about 70 to 80 cm in front of the eyes.
The described effect is mainly obstructing at darkness because then the pupils of eye dilate and with that the distance tolerance for sufficient sharp seeing is reduced.
REFERENCES:
patent: 5321718 (1994-06-01), Waarts et al.
patent: 5975728 (1999-11-01), Weyer
patent: 6031617 (2000-02-01), Berg et al.
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O'Shea Sandra
Papst Licensing GmbH & Co. KG
Welsh & Katz Ltd.
Zeade Bertrand
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